[volt-nuts] Fw: Datron 1281 / 1271 secret GPIB cmds for CALRAM-Readout

[Todd Micallef]

https://xdevs.com/fix/d1281/



On Sun, Feb 7, 2016 at 6:43 PM, <Ludger.Lenzen at gmx.de> wrote:

> Hi Todd,
> have tried to find the information @ xDevs. No luck.
> Is there a link you can share?
>
> BR
> PeLuLe
>
>
> > Gesendet: Sonntag, 07. Februar 2016 um 21:59 Uhr
> > Von: "Todd Micallef" <tmicallef at gmail.com>
> > An: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
> > Betreff: Re: [volt-nuts] Fw: Datron 1281 / 1271 secret GPIB cmds for
> CALRAM-Readout
> >
> > PeLuLe,
> >
> > I am currently working on two 1281's. If you have anything you would like
> > me to try, let me know. I am certain my cal constants are not good on one
> > of them. The battery was just changed a few days ago and it appears to be
> > the original from '87. I also had some intermittent NVRAM errors.
> >
> > Replacing caps worked for the first 1281 and cleared the DCV 2182 error.
> > The project is a WIP and everything is being documented on xDevs.
> >
> > Also, please post your FW versions. Both of mine are at different revs
> and
> > I would like to know the different versions from Datron/Wavetek
> >
> > On Sun, Feb 7, 2016 at 2:33 PM, <Ludger.Lenzen at gmx.de> wrote:
> >
> > >
> > >
> > > > Gesendet: Sonntag, 07. Februar 2016 um 18:30 Uhr
> > > > Von: Ludger.Lenzen at gmx.de
> > > > An: volt-nuts-bounces at febo.com
> > > > Cc: "Adrian Bernhard" <acbern at gmx.de>
> > > > Betreff: Datron 1281 / 1271 secret GPIB cmds for CALRAM-Readout
> > > >
> > > > Hi volt-nuts
> > > >
> > > > I like to backup the Datron 1281 CAL RAM data. Mine need to be
> > > refurbished (caps replacement, case cleaning...)
> > > > The 1281 quite good in cal (~3ppm difference to my 3458A which had
> last
> > > cal 2014/OCT), which I don't want to risk.
> > > > In any case this migh a helful knowledge for all of us.
> > > >
> > > > I am lucky having another 1281 "for part" without a Display- and
> > > DC-Assembly but a wokring Digital Board.
> > > > I dumped the ROM to have a deep look into the GPIB commands and
> searched
> > > for potential undocumented existing
> > > > (like it was done for the 3458A already).
> > > >
> > > > I found following, in the service and user manual not documented,
> > > potential commands (?):
> > > >   RAM = may a RAM command, seems to be the best chance
> > > >   PRIM = may a subfunction of RAM for primary RAM
> > > >   SECN = may a subfunction of RAM for secondary RAM
> > > >
> > > >   IPZ = no glue yet
> > > >
> > > >   YEUK = command to set something, no glue yet about function
> > > >   YEUK? = query comand of the YEUK command
> > > >
> > > >   CALISS? = seems to be a qery for calibration purpose
> > > >
> > > > To (hopefully) save some of the allways limited private time, I would
> > > like to aks, if some of you have seen that commands (?) or have more
> > > details on them. They may used at other Daltron tools also...
> > > > Next I will start with the debugging of the unknown remaining
> commands
> > > on processor board level.
> > > >
> > > > Thanks for help already in advance.
> > > > BR
> > > > PeLuLe
> > > >
> > > >
> > > >
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